Comparison of Sigma 10-20mm f/4-5.6 EX DC HSM and Tokina 11-16mm f/2.8 AT-X 116 PRO DX II SD

Attribute	Tokina 11-16mm f/2.8 AT-X 116 PRO DX II SD ×	Sigma 10-20mm f/4-5.6 EX DC HSM ×
Filter Size (mm)	77	77
Notes	Available AF Mounts: Canon EF, Nikon F, Sony Alpha; Autofocus now supported on Nikon bodies without AF motor; Included Accessories: BH-77B Lens Hood	Available AF mounts: Sigma, Canon, Nikon, Four-Thirds, Pentax, Sony
Closest Focus (m)	0.3	0.24
Magnification Ratio (x)	0.09	0.15
Type	Wide Zoom	Wide Zoom
Length (mm)	89	81
APS Equivalent	1.5x: 16.5 - 24mm; 1.6x: 17.6 - 25.6mm	1.5x: 15 - 30mm; 1.6x: 16 - 32mm; 2.0x: 20 - 40mm
Zoom System	Rotary	Rotary
Image Circle	APS-C	Image Circle
Focal Length (mm)	11.00 - 16.00	10.00 - 20.00
Brand	Tokina	Sigma
Name	Tokina 11-16mm f/2.8 AT-X 116 PRO DX II SD	Sigma 10-20mm f/4-5.6 EX DC HSM
Weight (g)	550	470
Aperture (f)	2.80 - 22.00	4.00 - 22.00
Diaphragm Blades	9	6
Diagonal Angle of View (degree)	82.00 - 104.00	63.80 - 102.40
Lens Construction	13 elements in 11 groups, including 2 SD (Super-low Dispersion) and 2 aspheric elements	14 elements in 10 groups, including three aspherical elements and three Special Low Dispersion (SLD) lenses
Diameter (mm)	84	83.5
Focus Details	Internal with One-Touch Focus Clutch mechanism	Internal with HSM